Strings

String

String is a data type used to represent a sequence of characters. It is an important part of the C++ language and is used to store, manipulate and process textual data. Strings are immutable objects, which means that once created, they cannot be changed.

Syntax

The basic syntax of a string in C++ is as follows:

string str = "string content";

This declares a string object named str and assigns it the value of string content.

Methods

C++ strings have a number of useful methods that can be used to manipulate strings.

Length

The length() method can be used to retrieve the length of a string. This method returns an integer value representing the number of characters in the string.

string str = "string content";
int len = str.length();

The above code assigns the value 12 to the variable len.

Concatenation

The + operator can be used to concatenate two strings. This creates a new string that is the combination of the two strings.

string str1 = "Hello";
string str2 = "World";
string str3 = str1 + " " + str2;

The above code assigns the value Hello World to the variable str3.

Substring

The substr() method can be used to extract a substring from a string. This method takes two parameters: an integer representing the starting position of the substring and an integer representing the length of the substring.

string str = "string content";
string sub = str.substr(0, 6);

The above code assigns the value string to the variable sub.

Conclusion

Strings are an important part of the C++ language and offer a number of useful methods for manipulating and processing textual data.